There's always a chance! A lot of standards aren't that huge compared to bantams, but then again, some standards are giants and some banties are teeny tiny!
But I don't know if you'd want too incredibly large roos with little hens, because (I'm guessing here) the hen's eggs will stay the same size no matter what breeds with her, and if the babies get the large size from daddy, you may have problems with the chicks in the shell. Or at least that's what happens with other animals. Like mules for example. You'd want a male donkey with a horse because the other way around...could you imagine a donkey giving birth to something the size of a baby horse!

Yes, I have done this plenty of times. Your fertility will not be as good, but, it will work. It will work either way, but, it's really hard on the bantam hen to be bred to a standard size rooster, I've done it with smaller large fowls like hamburgs as the rooster, and larger bantams, like rock bantams, and it worked ok. I would not use a huge rooster on a tiny bantam!! I've also used bantam roosters on large hens, which is much easier on the hens, but, the fertility is really bad.

Yep, I wouldn't have believed it was possible until my BTW Jap hatched a beautiful maran. It was small but grew to be about halfway between the size of a Jap and a marans hen. Real pretty little pullet.

Absolutely! My Barred Rock Roo Goliath mated with my Black Japanese hens and by summers end I had all these barred medium/banty sized chicks! They were beautiful too. The same is true for a banty roo, he will and can mate with standard sized hens. The results will always be a small to medium sized chicken.

so, if someone was trying to breed for color, and the most readily available source of the color she wanted was in bantam but she wanted a standard size, would you just need to cross F1 and F2 until you got the color right and then cross F3 and F1 for size? does that even make sense?

i have a standard roo that mated with banty hen. there is a pic on my BYC page of them in the same pic. (funny lookin couple) she is ALOT smaller than him. she laid 11 eggs and i have 5 of them left in the incubator due to hatch 10/19-10/20. so i know it can be done but still waiting to see the end results.

Your best bet would be to find a large fowl with the desired color in a type a close to the breed you are wanting. If you breed too far away, you are going to loose way too much in type to ever get back to it.